[feat] Append full messages instead of role and content #5907
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Motivation
The changes in the adapter are made to ensure that all fields from the original message (not just role and content) are preserved when constructing openai_compatible_messages.
This is important because:
Some downstream logic or templates may need access to extra fields like tool_calls, reasoning_content, etc.
Chat template should have control to those fields instead of removing them in SGLang side.
Modifications
Checklist